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Generation and Interaction Mechanism of Tension Kink Band in AZ31 Magnesium Alloy |
ZHOU Bo1,2,SUI Manling1,2() |
1. Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124, China 2. Beijing Key Laboratory of Microstructure and Properties of Solids, Beijing University of Technology, Beijing 100124, China |
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Cite this article:
ZHOU Bo, SUI Manling. Generation and Interaction Mechanism of Tension Kink Band in AZ31 Magnesium Alloy. Acta Metall Sin, 2019, 55(12): 1512-1518.
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Abstract The deformation structures, such as deformation twins, dislocations and kink bands, play an important role in the plasticity of magnesium alloys during the deformation process. However, due to the complexity of hcp structure, the deformation structures of the magnesium alloys, especially the interactions between deformation structures are still not well understood. Thus, it is of great scientific significance to study the microstructure of magnesium alloys, especially to characterize their structural characteristics of the interaction areas, which plays a significant role in understanding the structure and performance relationships of magnesium alloys. In this work, a combination of TEM and SAED pattern was applied to study the interaction mechanism associated with different kinds of deformation structures in Mg-Al-Zn (AZ31) alloy. When the applied external force is not beneficial for deformation twins and dislocations, kink bands act as a supplementary deformation mode to coordinate the asymmetry of hcp structure. According to crystallographic analysis, it is found that under the action of tensile stress nearly lie on basal plane in hcp structures, the basal dislocation pairs form and move to the opposite directions, forming tension kink band with the interface of {102} plane. The angle between the tension kink band interface and the basal plane is about 43°. The tension kink bands can further contribute to the strength and toughness of the material. These results will open a new insight into the understanding of interaction mechanism of deformation structures and greatly promote the development of Mg alloys.
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Received: 07 May 2019
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Fund: National Natural Science Foundation of China(Nos.11374028);National Natural Science Foundation of China(U1330112);National Natural Science Foundation of China(51621003);Scientific Research Key Program of Beijing Municipal Commission of Education(No.KZ201310005002);Beijing Municipal Found for Scientific Innovation(No.PXM2019_014204_500031) |
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